Product Description A warm and intense red-orange, Vermilion is a bold, versatile hue that is useful in everything from florals and still life works, to landscapes, abstracts, and illustration. Artist Notes: An intense red-orange, Vermilion mixes well with others, and creates particularly stunning orange hues when combined with Hansa Yellow. Opacity: Semi-Opaque Paint Makers Notes: Named for the historic pigment, which also happens to be a toxic combination of mercury and sulfur which darkens over time, Stonegrounds Vermilion gouache is a modern azo-based pigment that is non-toxic and lightfast. Pigment Number : PR 188 Pigment Type : Synthetic Organic Pigment Composition : Monoazo Lightfastness: II Very Good Toxicity : Non-Toxic